Had you navigated within tab A from an earlier search result? It's not very common, but some sites will assign an identifier to a new window (tab) and repeatedly use that new window (tab). Most sites simply open a new window or tab whenever needed rather than trying to re-use the same one. To further investigate this diagnosis, can you tell whether the problem is limited to searches conducted on one site?

Make sure that the focus of your cursor is inside the tab on which you are conducting a search

• click on empty space inside the tab before start working in a tab

BTW Some of your Firefox Plugins are out-dated, so Update them by going to the following link:

• http://www.mozilla.com/en-US/plugincheck/
• When Downloading Plugins setup files, Remove Checkmark from Downloading other Optional Softwares with your Plugins (e.g. Toolbars, McAfee, etc.)

'Had you navigated within tab A from an earlier search result? It's not very common, but some sites will assign an identifier to a new window (tab) and repeatedly use that new window (tab). Most sites simply open a new window or tab whenever needed rather than trying to re-use the same one. To further investigate this diagnosis, can you tell whether the problem is limited to searches conducted on one site? '

The only times I have really noticed it is when I have something running in Tab A. That's why its so annoying. I have, let's say, a game running in Tab A and have a question on what to do next. So I open Tab B and type "walk through" and hit return and the computer begins to look for results in Tab B. I then flip back to Tab A. Except that when the results pop up, they then pop up in Tab A, rather than Tab B and I lose my game. Or movie, or song, or whatever it is I was doing in Tab A. It does happen other times, but its only when there is something that I lose info on that it drives me nuts.

what extensions do you have installed in tools > addons > extensions & does the same problem occur when you run firefox in safemode?

Diagnose Firefox issues using Troubleshoot Mode

Nothing extreme in my add-on. Flash, DiVX, Adobe, Logitech. I think that's about it. No idea on the safe mode. I'll try it once I'm not (once again) running three things at once :-)

If you are running your search from the search box on the navigation toolbar, one alternate approach is to press Alt+Enter to force the results to a new tab. If you are searching within the page (e.g., using the Google home page or a Google results page), then the results really should be staying within tab B...

Alternatively, if searching in the Firefox search box, click the search button with the mouse wheel.